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ascidian

[uh-sid-ee-uhn]

noun

any solitary or colonial tunicate of the class Ascidiacea, exhibiting in the larval stage the vertebrate characteristics of a notocord and hollow nerve cord.

adjective

belonging or pertaining to the class Ascidiacea.

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Ascidian is always a great word to know.

So is aschelminthes. Does it mean:

phylum of worms with bilateral symmetry and soft, usually flattened bodies

major grouping of small-to-microscopic pseudocoelomate organisms

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Origin:
1855–60; < Neo-Latin Ascidi(um) a tunicate genus (see ascidium) + -an

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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Collins

World English Dictionary

ascidian (əˈsɪdɪən)

—n
1.	any minute marine invertebrate animal of the class Ascidiacea, such as the sea squirt, the adults of which are degenerate and sedentary: subphylum Tunicata (tunicates)
2.	ascidian tadpole the free-swimming larva of an ascidian, having a tadpole-like tail containing the notochord and nerve cord

—*adj*
3.	of, relating to, or belonging to the Ascidiacea

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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ascidian

as·cid·i·an